Don't let the assertion errors raised by the ticket model classes propagate as internal errors in the WebAdmin module, but transform them into normal Trac errors. Related to #4563.
Don't let the assertion errors raised by the ticket model classes propagate as internal errors in the WebAdmin module, but transform them into normal Trac errors. Related to #4563.

git-svn-id: 0d96b0c1a6983ccc08b3732614f4d6bfcf9cbb42@5239 af82e41b-90c4-0310-8c96-b1721e28e2e2

rbaumg/trac,rbaumg/trac,rbaumg/trac,rbaumg/trac